High-resistance permanent magnet synchronous motor

Abstract

The invention discloses a high-resistance permanent magnet synchronous motor which is characterized in that a rotor comprises a rotating shaft, an iron core, permanent magnets and a starting squirrel cage; the iron core is arranged on the rotating shaft; the iron core is provided with permanent magnet troughs and a squirrel cage trough; the permanent magnets are arranged in the permanent magnet troughs; the starting squirrel cage is arranged in the squirrel cage trough; and the starting squirrel cage is made of a high-resistance aluminum material. The high-resistance aluminum rotor starting squirrel cage can reduce surge impact of starting current to a power grid and is started in a manner of increasing a starting torque in a current-limited mode, and operation performance reduction is prevented. On the condition that the rotor is started to rotate in an asynchronous manner, after the rotor is drawn by the magnetic field of the permanent magnets into synchronous rotation, no induction current is generated on a starting squirrel cage strip, and no loss is realized; the rotor does not require electromagnetic conversion for generating the magnetic field; and motor operation is sustained by means of the magnetic field of the permanent magnets, thereby improving starting efficiency, power factor and operation performance of the motor.

Description

technical field [0001] The invention relates to a synchronous motor, in particular to a high-resistance permanent magnet synchronous motor. Background technique [0002] Since 1983, the famous British scholar T.J.E.Miller first proposed the concept of asynchronous starting permanent magnet synchronous motor at the IEEE conference in Mexico, and published a paper in a magazine the following year. Countries around the world have gradually carried out research on asynchronous starter permanent magnet synchronous motors. In December 1997, my country also had the book "Modern Permanent Magnet Motor Theory and Design" written by Tang Renyuan of Shenyang University of Technology. Started with production. During the period, it has been applied in textile and oil fields where high starting torque and low power operation are required. However, due to the cost of permanent magnets, the development is slow. [0003] With the advent of new materials for permanent magnets, costs have f...

AI Technical Summary

Problems solved by technology

[0004] The biggest contradiction is that when starting with a heavy load, the starting current of the motor is too large, which will cause a surge impact on the power grid, resulting in tripping and power failure.

At the same time, under the action of super high current, the temperature rise of the motor is too high, the stator coil is carbonized, and the permanent magnet is demagnetized, the efficiency of the motor is reduced, and the working performance is unstable.

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